INDUSTRIAL A N D ENGINEERING
154
VOL. 13, N O . Τ
CHEMISTRY
Industrial News TEMPERATURE
CONTROL
T H E new pyrometer controller Model 478, offered b y the Bristol C o . , W a t e r b u r y , Conn., possesses degree-splitting charac teristics t h a t permit an unflinching check over a n y heating proc ess. Precision shear-edge action of t h e working mechanism raises t h e quality of the product to new s t a n d a r d s of uniformity.
BATCH M I X E R
t h e materials are passed o u t w a r d ; they a r e then turned witlTside plows and scrapers a n d carried back into the mixing area b y t h e revolving p a n in a continuous cycle. " D e a d s p o t s " are elimin a t e d . E v e r y portion of t h e batch is subjected t o the a c t i o o of t h e mixing units with every revolution of t h e pan, and a uniform mix of all t h e ingredients is secured. The c o m p a n y r e ports t h a t a greater tonnage of material c a n be handled in a giveo period of time, with corresponding savings in t h e a m o u n t of e q u i p ment required and t h e cost of operating it. V A L V E P O S I T I O N INDICATOR TEMPERATURE CONTROLLER
It has several outstanding features: clean, non-arcing, nonoxidizing, non-corroding mercury-to-mercury electric contacts, sealed in glass; no need for relays; operating mechanism always visible; accessibility of telechron motor, mercury switches, a n d terminal block, simplifying field inspection w i t h o u t exposing control mechanism to dirt, fumes, or misalignment; full safety features; accurate control; simple and rugged working p a r t s . X-RAY
S H I E L D OF B A K É L I T E
SCIENTIFIC BATCH
glance w H e t h e r being m a r k e t e d R. I . I t operis applicable t o
LAMINATED
A N E W x-ray s h i e l d of B a k é l i t e laminated has b e e n d e v e l o p e d b y Joseph C . R a h & Co., Chicago, 111., using Bakélite laminated in place of other types of materials. This shield is designed for portable shock-proof x-ray equipment for industrial purposes, such as x-raying castings and joints. Bakélite laminated is used, rather t h a n other materials, because it acts as a good insulator a t t h e 75,000 volts necessary in x-ray work, a n d still remains opaque to x-ray radiation, particularly in t h e vicinity of t h e target. This new t y p e of x-ray shield c a n be produced a t less cost t h a n other t y p e s , and yet it contains all of t h e properties required in a serviceable shield. T h e shield is made b y w r a p p i n g a Bakélite laminated t u b e on a m a n d r e l and curing it hard enough t o p e r m i t X - R A T SHIELD machining. A groove is then c u t into it a n d lead foil of the proper thickness is rolled i n . T h e thickness of the lead depends upon t h e p e n e t r a t i n g powers of x-rays. Additional varnish-impregnated p a p e r is w r a p p e d on t h e t o p of t h e first one, which contains t h e lead s t r i p a n d t h e whole shield is cured properly. This Bakélite laminated tube, when tested, was opaque t o x-rays generated b y 125,000 volts a n d resisted a flashover of 130,000 volts.
THE
A VALVE POSITION INDICATOR which tells a t a a valve is s h u t or how m a n y t u r n s it is open is b y TefTt-Jackson, I n c . , 29 River St., P a w t u c k e t , ates b y a positive gravity mechanism, s o t h a t it
MIXER
C. O . B A R T L E T T AND SNOW C O . , 6200 H a r v a r d
VALVE POSITION
INDICATOR
valves whose stems a r e in a horizontal or semi-horizontal position. T h e indicator is adjustable in its own bracket whicL· replaces t h e regular valve wheel, and this facilitates r e s e t t i n g when the valve wears or when new seat and disk a r e installed. A number of sizes a r e available, a n d a special a t t a c h m e n t mayb e h a d for large valves, rising stem valves, a n d overhead c h a i n operated valves. NEW
PRESSURE FIRE
EXTINGUISHER
A N E W 2-quart vaporizing liquid fire extinguisher t h a t is d i s charged b y air pressure and delivers a fan-shaped spray as well a s a solid stream is announced b y t h e Pyrene M a n u f a c t u r i n g C o . , Newark, N . J. This extinguisher, k n o w n as t h e Pyrene 2 - q u a r t pressure t y p e , is recommended for incipient fires in all classes o f material, a n d especially for flammable liquids a n d electrical fires.
Ave.,
Cleveland, Ohio, is offering t h e Lancaster mixer for t h e b a t c h mixing of glass, foundry sand, abrasives, refractories, clays, p u t t y , asphalts, enamels, pharmaceuticals, a n d other mixes of d r y or plastic consistency. A unique feature of t h e design is the revolving p a n t h a t carries t h e ingredients t o t h e mixing area where one or more assemblies of plows o r plows a n d mullers, whirling in counterdirection, produce a thorough a n d homogeneous mix. From t h e mixing area,
T H E U. S. B O T T L E B S M A C H I N E R Y C o . exhibited for t h e
first
t i m e a t t h e National Wine a n d L i q u o r Show, Hotel S t e v e n s , Chicago, in March, a n a u t o m a t i c capping machine of an e n t i r e l y new design, presenting new features for t h e handling of t h e c a p ping of bottles or a n y container using screw caps. I t is a fully automatic machine with built-in micromatic control.
